Glutathione S-transferase homozygous deletions and relapse in childhood acute lymphoblastic leukemia: A novel study design in a large Italian AIEOP cohort

Raffaella Franca, Paola Rebora, Giuseppe Basso, Andrea Biondi, Giovanni Cazzaniga, Sergio Crovella, Giuliana Decorti, Franca Fagioli, Emanuela Giarin, Franco Locatelli, Vincenzo Poggi, Maria Grazia Valsecchi, Marco Rabusin

Research output: Contribution to journalArticlepeer-review

Abstract

Aim: In the AIEOP-BFM 2000 trial, 15% of pediatric patients treated according to risk-adapted polychemotherapeutic regimens relapsed. The present study aimed to investigate the influence of GST-M1 and GST-T1 deletions on clinical outcome of children with acute lymphoblastic leukemia treated according to the AIEOP-BFM ALL 2000 study protocol. Materials & methods: A novel-design, two-phase study was applied to select a subsample of 614 children to be genotyped for the deletions of GST genes. Cumulative incidence of relapse was then estimated by weighted Kaplan-Meier analysis, and the Cox model was applied to evaluate the effect of GST-M1 and GST-T1 isoenzyme deletions on relapse. Results: No overall effect was found, but the GST-M1 deletion was associated with better clinical outcome within prednisone poor-responder patients (hazard ratio [HR]: 0.45; 95% CI: 0.23-0.91; p = 0.026), whereas the GST-T1 deletion was associated with worse outcome in the standard-risk group (HR: 4.62; 95% CI: 1.04-20.6; p = 0.045) and within prednisone good responders (HR: 1.62; 95% CI: 1.02-2.58; p = 0.041). Conclusion: Our results show that GST-M1 and GST-T1 homozygous deletions have opposite correlation with relapse, the former being protective and the latter unfavourable in specific subsets of acute lymphoblastic leukemia patients. Original submitted 1 August 2012; Revision submitted 27 September 201.

Original languageEnglish
Pages (from-to)1905-1916
Number of pages12
JournalPharmacogenomics
Volume13
Issue number16
DOIs
Publication statusPublished - Dec 2012

Keywords

  • acute lymphoblastic leukemia
  • glutathione S-transferase
  • polymorphisms
  • prognostic genetic factors
  • relapse
  • risk-adapted polychemotherapy
  • two-phase design

ASJC Scopus subject areas

  • Pharmacology
  • Genetics
  • Molecular Medicine

Fingerprint Dive into the research topics of 'Glutathione S-transferase homozygous deletions and relapse in childhood acute lymphoblastic leukemia: A novel study design in a large Italian AIEOP cohort'. Together they form a unique fingerprint.

Cite this